01024+3735 Scan 2255


Observing log information

  Object:           01024+3735
  On scan num:      2255 2257 2259 2261 2263 2265 2267 2269 2271 2273
  Off scan num:     2256 2258 2260 2262 2264 2266 2268 2270 2272 2274
  R.A.:             1.091121 hrs
  Dec.:             37.852804 deg
  On azimuth:       279.357327 deg
  On zenith dist.:  26.285798 deg
  Off azimuth:      279.342386 deg
  Off zenith dist.: 26.254631 deg
  MJD:              52254
  UTC:              0.137245
  Center freq.:     1391.213572 MHz
  Doppler:          -0.00006741
  Num. correlators: 2
  Spectrom. atten.: 34 40 dB
  Bandwidth:        10.0 MHz
  Num. channels:    1024
  Eff. integration: 2760 seconds

Raw spectrum

This spectrum is the integration of all data for the scan with spectra from both polarizations added together. The spectral intensities are Ssys * (on - off) / off, where Ssys is the system temperature in Jy. The system noise flux density equivalent is calibrated for each scan with a calibration noise source firing during each scan. The cal value, in Jy, is calibrated by comparison with a number of continuum sources as described in the summary web page

Figure 1. Unedited spectrum

Edited spectrum

This spectrum is the same as Figure 1 but with 8 60-second sub-integrations manually deleted because of interference or a bad baseline.

Figure 2. Edited spectrum

Measured spectrum

This is the section of spectrum measured to obtain the parameters listed below. The three horizontal dotted lines are the baseline, the peak level selected, and 20% of the peak level. The two vertical dotted lines mark the selected 20% line width edges. The solid horizontal line marks the velocity range chosen for the the line profile flux density integral. This spectrum has a second-order least squares fit baseline removed using most of the baseline shown in Figure 2. Narrow band interference was removed from 3 channels by interpolation between the nearest valid channels

Figure 3. Measured spectrum

Measured parameters

  Peak intensity:      0.004 Jy
  Lower 20% velocity: 6027.3 km/s
  Upper 20% velocity: 6460.7 km/s
   Systemic velocity: 6244.0 km/s
   Line width (20%):   433.3 km/s
  Profile integral:    1.17 Jy * km/s
                 A:    1.88
                 B:    1.68
         Ratio B/A:   0.892
  Flux integral
     velocity range:  5993.5 - 6487.6 km/s


extremely low SNR